Explanation
After they reached the old school building, they entered the room of Occult Research Club.
"W-What is this room?" -Katase
Because Issei saw it from the DxD anime, he wasn't surprised by the atmosphere of this room.
"Toujou Koneko-chan is also here." -Murayama
Koneko, who was eating snacks on the Victorian-style sofa, turned and nodded at them. Then they heard a sound from their right side.
"A shower? ... in the club room?" This confused Murayama and Katase. Since it was the first time they saw a shower room in the club room.
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"Buchou, you have a guest." -Akeno
"Thank you, Akeno." Rias who was taking a shower replied to Akeno.
Akeno turned around and says, "Ara... Ara ara." Then walked toward Issei's group.
"Nice to meet you," Akeno said as she bowed toward Issei's group.
"I'm the vice-president, Himejima Akeno. I'm pleased to make your acquaintance." She Introduced herself while giving out Onee-san vibes.
Then Issei's group introduced themselves as well. The same goes for other members.
"Sorry for the wait." After Rias got dressed, she came out from a shower room.
"No problem, Rias Onee-sama." x2 (Murayama, Katase)
"No problem at all." -Issei
"Okay, since all of us are here, please sit down and let's talk." -Rias
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Then everyone sat on the sofa with Issei sitting in the middle between Murayama and Katase.
"We welcome you into the Occult Research Club." -Rias
"Y-Yes" x2 (Murayama, Katase)
"But the Occult Research Club is just an assumed front. Sort of a hobby of mine." -Rias
"Hobby?" x2
"I'll come right to the point... We are devils." -Rias
"Huh?!" x2
"The man with black wings who attacked you guys yesterday is a fallen angel."-Rias
"Ehhh?!" x2
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Then Rias began to tell them about the three factions by started with fallen angels.
"They were angels in the service of God, but they possessed by corrupt emotions, so they fell from Heaven and descended into the Underworld."
"They are attempting to wipe out us devils while they manipulate humans."
"Since ancient times, they have fought for supremacy of the underworld, what you in the human realm call Hell."
"Aside from fallen angels, there are also angels sent by God with the order to defeat us."
"In other words, there's a three-way standoff."
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"Have you guys understood everything up to now?" -Rias
"It's a bit difficult for me..." -Murayama
"Issei-kun, it seems like you already knew about this?" Katase looked at Issei who seems to understand what Rias told them.
"Well... because I'm also a devil, that's why the guy from yesterday attacked us." -Issei
"Ehhh!!!" x2 (Murayama, Katase)
The girls exclaimed after Issei told them he was also a devil as well.
"Y-You are a devil?" -Katase
"That's right. I used to be human before, but now I'm a devil." -Issei
"What do you mean you used to be human?" -Murayama
"Well, I was killed three days ago." Issei was killed after he went on a date with Raynare.
"Ehhhh!!!" x2
"B-But, if you were killed, Then why are you still alive?" -Katase
"This question, I'll be the one to answer," Rias said, and then she got their attention.
"Issei has been reborn." -Rias
"Reborn?!" x2
"Yes, he has been reborn as a reincarnated devil of the house of Gremory as my devil servant." Then Rias and her peerage showed their wings to Murayama and Katase. This made them feared, so they started clinging to Issei.
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"It's alright. It's not like they are going to eat you girls or something." Issei patted their back as he consoled them.
"Although I said we are devils, we still need humans to sign contracts with us, which increase our power and standing in the Underworld." -Rias
"We just need to give this to someone who we think they can summon us." Then Rias showed the girls her peerage's amulet paper.
"What can it do?" -Katase
"It will be used to contact and summon us." -Rias
"Just that?" -Murayama
"Of course not. After we were summoned, we will grant the client's wish, then they sign a contract with us as payment." -Rias
"You can use it to ask him to become your boyfriend as well, Ufufu" -Akeno
Murayama and Katase blushed after they heard that.
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"Now, let me explain why I was killed," Issei said and gained their attention.
"Amano Yuuma." -Issei
"Amano Yuuma?" x2 (Murayama, Katase)
"Here." Rias then showed them the picture of Issei and Raynare.
"Who is she?" -Murayama
"My ex-girlfriend." -Issei
"E-Ex-girlfriend!!" -Katase
"Well, I think it's just a lie since she just wanted to accomplish her objective." -Issei
"Objective?" x2
"To kill me." -Issei
"Eh!!!" x2
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"She is also a fallen angel like the one that attacked you guys yesterday." -Rias
"She came to befriend Issei to ascertain whether or not there was something dangerous within his body. Once that was verified, she killed him." -Rias
"Something dangerous?" x2
"Sacred Gear." -Issei
"Sacred Gear?" x2
"It's a non-standard power that dwells within specific people. It is said that many historic figures have possessed this power." -Akeno
"And sometimes, there are even those who have enough power that they become a threat to devils or fallen angels." -Rias
"That's why she killed Issei before he becomes a bigger threat even though she didn't know what is his Sacred Gear." -Rias
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Then Issei summoned Boosted Gear and showed them.
"This is my Sacred Gear." -Issei
"Ah! It's the gauntlet I saw yesterday." -Murayama
"What is it called?" -Katase
"It's called [Boosted Gear] as known as [The Red Dragon Emperor's Gauntlet]." -Issei
"Boosted Gear?" x2
"It is one of the thirteen [Longinus] also known as [Tools that Destroy God]." -Rias
"It can double his powers every ten seconds... allowing him to transcend even God and Satan momentarily." -Rias
"Transcend God and Satan!!!" x2
Murayama and Katase exclaimed after they heard that. Others in the club room were also surprised that Issei is the current wielder of Boosted Gear.
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"Well, it will take too much time for me to double my power till I reach that point." -Issei
["Because you sucks."] -Ddraig
"Goddammit Ddraig! As I said, I'm sorry, okay?! Please stop saying that." -Issei
["I'm bored."] -Ddraig
"Then why don't you say something else, you bastard!" -Issei
"This gauntlet can talk?!" x2
"Well, the reason why it's called The Red Dragon Emperor's Gauntlet because it has the spirit of the real dragon sealed within." -Issei
"Dragon!!" x2
["The name is Ddraig. Nice to meet you."] -Ddraig
"N-Nice to meet you too." x2
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"Now, what will you two do after you know this." - Rias
"W-We haven't thought anything about it yet." x2
"Since you girls chose not to erase your memory yesterday, you should quit Kendo Club and join our Occult Research Club for your own safety." -Rias
"Join the club of Rias Onee-sama?" -Katase
"Can we join this club even if we are human?" -Murayama
"Yes, you can. So, what about your answer?" -Rias
"Yes, with pleasure." x2
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Suddenly Koneko and Akeno asked Rias.
"Buchou, is it okay?" -Koneko
"They are normal humans, it will be dangerous for them, you know, Rias?" -Akeno
"It's alright. We can let them sign a contract with Issei. I'm sure they are okay with it, right?" -Rias
"Y-Yes... B-But... I don't know about my wish yet." -Murayama
"Me as well..." -Katase
"How about stay at my house?" -Issei
"Huh?!" everyone in this room except Issei exclaimed.